EP1775364A1 - Three-dimensional knit fabric, interlining material and complex fabric - Google Patents

Three-dimensional knit fabric, interlining material and complex fabric Download PDF

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Publication number
EP1775364A1
EP1775364A1 EP05761808A EP05761808A EP1775364A1 EP 1775364 A1 EP1775364 A1 EP 1775364A1 EP 05761808 A EP05761808 A EP 05761808A EP 05761808 A EP05761808 A EP 05761808A EP 1775364 A1 EP1775364 A1 EP 1775364A1
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EP
European Patent Office
Prior art keywords
knit fabric
dimensional knit
dimensional
laminate
fabric
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP05761808A
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German (de)
English (en)
French (fr)
Inventor
Kenji Hamamatsu
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Asahi Kasei Corp
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Asahi Kasei Fibers Corp
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Publication date
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Publication of EP1775364A1 publication Critical patent/EP1775364A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/083—Multi-layer felts
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/02—Cross-sectional features
    • D10B2403/021—Lofty fabric with equidistantly spaced front and back plies, e.g. spacer fabrics
    • D10B2403/0213—Lofty fabric with equidistantly spaced front and back plies, e.g. spacer fabrics with apertures, e.g. with one or more mesh fabric plies
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/04—Filters

Definitions

  • the present invention relates to a three-dimensional knit fabric comprising a yarn constituting front and back knit layers and a connecting yarn composed of a monofilament, which connects the front and back knit layers, which knit fabric is suitable as a filter material, in particular, a filter for liquid or gas in the form of a laminate, and relates to an interlining material using the three-dimensional knit fabric and a multilayered laminate comprising the three-dimensional knit fabric and another material.
  • a nonwoven fabric alone, a laminate of nonwoven fabrics, a mesh woven fabric alone or a woven fabric with different fabric densities is used as it is, or a woven fabric integrated with a nonwoven fabric of short or continuous fiber such as synthetic fiber by a needle punch is generally used.
  • a press part which is a type of a liquid filter in a papermaking process
  • water is squeezed out of wet paper with a needle felt and a pair of press rolls to produce paper.
  • Various laminates are widely used as filter materials for water squeezing.
  • a single felt material composed of a nonwoven fabric or a laminate of felt materials is used as a liquid filter or an air filter, or a laminate using a reinforcing structure as an interlining material therewith is used.
  • a needle felt used for water squeezing is generally composed of upper and lower felt materials of a nonwoven fabric and a mesh woven fabric which is an interlining material. It is required that the upper and lower felt materials are hardly clogged even after long time use.
  • an interlining material as a reinforcing material make the felt material difficult to be extended due to settling.
  • a mesh woven fabric, woven or knitted fabric made of ordinary high strength fiber or a structure in which strands are aligned and partly bonded is practically used as an interlining material, i.e., a reinforcing material.
  • Interlining materials must first have high strength, small elongation, and be easily entangled or integrated with nonwoven fabric or felt laminated on the upper and lower sides, and difficult to be separated therefrom.
  • excellent filterability maintaining the initial filterability when repeatedly used and good dimensional stability with little elongation are required.
  • the thickness of felt is significantly reduced by repeated compression, and the water squeezing properties and the durability are not sufficient.
  • Patent Document 1 discloses a method in which an opening is formed in an anti-rewetting layer in order to improve the water squeezing properties of a felt used as a felt for papermaking.
  • the water squeezing properties are not sufficient even in the method, and neither was the durability.
  • Patent Document 2 discloses that a felt for papermaking excellent in durability can be obtained by using a polyketone fiber for the pad layer.
  • the durability is insufficient when the felt for papermaking is merely composed of such a specific material.
  • interlining materials and laminates which can be entangled well when laminated and integrated so as to form an air filter or a liquid filter, do not settle and can maintain sufficient effects such as water squeezing properties are in demand.
  • Patent Document 1 JP-A-2003-89990
  • Patent Document 1 JP-A-2003-119687
  • An object of the present invention is to provide a novel three-dimensional knit fabric having excellent filterability, in particular, filterability for fine particles, excellent water squeezing properties and excellent durability when used for various filters as a laminate, an interlining material and a laminate using the same.
  • the present inventors have conducted intensive studies to solve the aforementioned problems and focused on the high void retaining ability of a three-dimensional knit fabric, and found that the filterability and the durability of a filter material are significantly improved by using the three-dimensional knit fabric as an interlining material and laminating and integrating a nonwoven fabric on the upper and lower sides, and completed the present invention.
  • the present invention provides:
  • the three-dimensional knit fabric and the interlining material and the laminate comprising the three-dimensional knit fabric of the present invention are used as an air filter, a liquid filter, in particular, a felt for papermaking, there is an advantage that water squeezing properties of the felt for papermaking can be significantly improved and the compression recovery and the compressive residual strain are small, and the practical durability is excellent.
  • the three-dimensional knit fabric of the present invention can be knitted by a double raschel knitting machine or a double circular knitting machine with two needle rows. Knit layers having a plurality of openings such as mesh knit layers or marquisette knit layers may be used for the front and back knit layers. In particular, denbigh structure and queens cord structure are preferred because the irregularities on the surface are small.
  • the front and back knit layers may have the same or different knit structure.
  • the three-dimensional knit fabric comprises a yarn constituting front and back knit layers and a connecting yarn composed of a monofilament, which connects the front and back knit layers.
  • a synthetic fiber monofilament having a single yarn size of 15 dtex to 1000 dtex is preferably used as the connecting yarn.
  • the size is more preferably 50 dtex to 400 dtex, most preferably 100 dtex to 300 dtex.
  • the type of the monofilament to be used is not particularly limited, but monofilaments composed of a melt spinnable synthetic resin such as polyester, polyamide, polypropylene or polyethylene may be used.
  • the cross-sectional shape of the yarn may be circular or polygonal including a triangular shape, an L-shape, a T-shape, a Y-shape, a W-shape, a four-leaf shape, an eight-leaf shape, a flat shape or a dog bone shape, a multi-leaf shape, a hollow shape or an indefinite shape.
  • a circular cross-section is preferred because the tensile strength is high.
  • Monofilaments made of synthetic fiber make it possible to diminish decrease in the thickness due to repeated compression and significantly prevent deterioration of water squeezing properties when used as, for example, a felt for paper making in the form of a laminate.
  • a monofilament having a single yarn size of less than 15 dtex is used as the connecting yarn or a multifilament is directly used, the three-dimensional knit fabric has poor thickness retaining properties for repeated compression.
  • Use of a monofilament having a single yarn size of 1000 dtex or more as the connecting yarn is not preferred because the flexural rigidity of the monofilament is too high and knitting of the three-dimensional knit fabric is extremely difficult.
  • Such monofilaments may be produced by a method of producing a monofilament using air cooling or water cooling with known melt spinning.
  • An ordinary melt spinnable fiber made of synthetic resin, regenerated fiber and natural fiber may be used as the fiber constituting front and back knit layers of the three-dimensional knit fabric.
  • the type of the constituent fiber is not particularly limited, but synthetic fibers composed of polyester, polyamide, polyacrylonitrile, polypropylene, polyethylene, aramid, polyketone, polyphenylenesulfide or polyetheretherketone resin, which can be formed by melt spinning, dry spinning or wet spinning, may be used.
  • the cross-sectional shape of the fiber may be circular or polygonal including a triangular shape, an L-shape, a T-shape, a Y-shape, a W-shape, a four-leaf shape, an eight-leaf shape, a flat shape or a dog bone shape, a multi-leaf shape, a hollow shape or an indefinite shape.
  • the fiber constituting the front and back knit layers has a size of preferably 0.1 dtex to 300 dtex for the three-dimensional knit fabric.
  • the single yarn size is more preferably 10 to 300 dtex.
  • the fiber is more preferably a monofilament of 20 dtex or more.
  • a three-dimensional knit fabric comprising front and back knit layers and a connecting yarn composed only of a monofilament is most preferred.
  • Use of a multifilament of 0.1 dtex or less for front and back knit layers is not preferred because yarns constituting the front and back knit layers of the three-dimensional knit fabric are broken by a needle when short fiber is integrated with the three-dimensional knit layers which is an interlining material by a needle punch, and the broken part of the yarns is depressed in a concave shape, and the laminate has poor durability.
  • the three-dimensional knit fabric of the present invention is used as, in particular, a laminate in which layers are laminated on the upper and lower sides
  • use of a monofilament having a size of 10 dtex or more as the fiber constituting the front and back knit layers of the three-dimensional knit fabric is preferred because it makes it possible to prevent breakage of fiber in the step of entangling and integration by needlepunching and there is no decrease in the strength of the three-dimensional knit fabric.
  • one of the many voids formed on at least one side of the front and back knit layers must have a maximum area of 0.1 mm 2 to 6.0 mm 2 .
  • a void in at least one side of the front and back knit layers has a maximum area of less than 0.1 mm 2 , the laminate has poor permeability of air or liquid, and consequently the filterability is reduced.
  • a maximum area of more than 6.0 mm 2 is not preferred because entanglement with nonwoven fabric laminated on upper and lower sides is poor, and the shape of the void remains on the surface of the laminate even after lamination, and therefore when the three-dimensional knit fabric is used as a laminate for papermaking, the pattern of the knit fabric is transferred to wet paper after dehydration, sometimes causing wrinkles or breakage of wet paper.
  • the three-dimensional knit fabric may be used as an interlining material used for laminating with another material.
  • Nonwoven fabrics, cotton materials or paper materials may be used as another material to be laminated.
  • Another material is made of at least one member of a synthetic fiber, a regenerated fiber, a natural fiber and pulp, and a nonwoven fabric material (hereinafter felt) composed of short fiber having a single yarn size of 0.01 to 25 dtex can be used.
  • felt nonwoven fabric material
  • the cross-sectional shape of the constituent fiber may be circular or polygonal including a triangular shape, an L-shape, a T-shape, a Y-shape, a W-shape, a four-leaf shape, an eight-leaf shape, a flat shape or a dog bone shape, a multi-leaf shape, a hollow shape or an indefinite shape.
  • the felt has a weight of preferably 10 to 2000 g/m 2 , more preferably 15 g/m 2 or more. Which felt is to be used can be accordingly determined depending on the purpose of use.
  • the interlining material composed of the three-dimensional knit fabric and the felt laminated on the upper and lower sides thereof can be entangled by a known needle punch method or a columnar stream.
  • the needle punch method is a method for mechanical entangling by a needle.
  • the felt and the interlining material composed of the three-dimensional knit fabric can be laminated and entangled and integrated by a needle punch machine.
  • the needle density which is an index of entanglement is preferably 5 to 50 times/cm 2 , which may be changed depending on the fiber material to be used.
  • Entangling by a columnar stream is a method using a known spun lace machine, in which water is ejected at high pressure in a columnar stream through pores, thereby entangling upper and lower layers by hydraulic power.
  • the felt and the three-dimensional knit fabric may be entangled so that they are not separated.
  • Entangling with a needle punch machine is effective for a felt having a relatively large single yarn size of, for example, 1 to 25 dtex, and is useful for liquid filters.
  • entangling with a columnar stream is effective for a felt having a small single yarn size of 0.01 to 1 dtex and is useful for air filters.
  • the three-dimensional knit fabric used as an interlining material of a liquid filter has a permeation rate of liquid, for example, water of 1 to 10 ml/cm 2 ⁇ second.
  • a permeation rate of liquid for example, water of 1 to 10 ml/cm 2 ⁇ second.
  • the permeation rate of water is 1 ml/cm 2 ⁇ second or less, filtration efficiency and water squeezing properties are poor.
  • tufting is difficult in the step of integrating the felt and the three-dimensional knit fabric by a needle punch.
  • a permeation rate of water of 10 ml/cm 2 ⁇ second or more is not preferred because filtration efficiency is reduced when the laminate is used as a filter.
  • the three-dimensional knit fabric used as an interlining material of an air filter has an air pressure loss of 300 Pa or less.
  • An air pressure loss of 300 Pa or more is not preferred because energy required for passing fluid to be filtered is high and a fan with high energy is needed. Also, there is a defect that the life of the filter is shortened due to clogging.
  • the laminate may also be used as an air filter substrate, a liquid filter material, in particular, a substrate for a felt for papermaking.
  • the thickness of the three-dimensional knit fabric used for a felt for papermaking in the form a laminate is not particularly limited, but the thickness is preferably about 1.5 mm to 6 mm in view of the water squeezing properties and the durability.
  • the water squeezing properties herein described mean dehydration of wet paper materials by applying pressure from the upper and the lower sides using the laminate.
  • the three-dimensional knit fabric and the laminate using the three-dimensional knit fabric as an interlining material herein used have a permeation rate of water of 0.4 to 2.0 ml/cm 2 ⁇ second.
  • a permeation rate of water of 0.4 ml/cm 2 ⁇ second or less is not preferred because water squeezing properties are poor.
  • a permeation rate of water of more than 2.0 ml/cm 2 ⁇ second is not preferred because filtration efficiency is reduced when the knit fabric or the laminate is used as a filter and the pattern of the interlining material to be used is transferred.
  • the laminate may be used as an air filter. When used as an air filter, filtration of fine particles in the air and maintaining filtration efficiency and pressure loss are important.
  • a fiber having a single yarn size of 0.01 to 25 dtex prepared by a method of producing nonwoven fabric, for example, a melt blow method, a spunbond method or a dry method may be used.
  • the single yarn size is preferably 0.02 to 1 dtex.
  • a known spun lace machine is used for lamination and entangling with the three-dimensional knit fabric.
  • a felt having a weight of about 20 to 200 g/m 2 is preferred. The same or different felt may be used on the upper and lower sides of the three-dimensional knit fabric.
  • the laminate has a pressure loss of 300 Pa or less.
  • the laminate has collection efficiency for particles of 0.1 to 5.0 ⁇ m of 80% or more. The pressure loss and the collection efficiency for particles can be measured by a known method (e.g., JP-A-07-100315 ).
  • Three-dimensional knit fabric A Using a double raschel knitting machine of 18 gauge equipped with 5 guide bars and having a bed gap of 4.6 mm, 200 dtex nylon 6 monofilament yarns were fed from guide bars (L2, L3) located at the center to the guide in a 1-in 1-out arrangement as the connecting yarn, 167 dtex/48f polyethylene terephthalate multifilament yarns were fed from a guide bar (L1) located in front of the knitting machine to the guide in an all-in arrangement as yarns for the front knit layer, and 167 dtex/48f polyethylene terephthalate multifilament yarns were fed from two guide bars (L4, L5) located at the back of the knitting machine to the guide in a 1-in 1-out arrangement as yarns for the back knit layer at a knitting density of 20.4 courses/2.54 cm to give a three-dimensional knit fabric having mesh front and back layers with the following knit structure.
  • the three-dimensional knit fabric was scoured at 75°C and heat set (180°C) while stretching.
  • the resulting three-dimensional knit fabric has dimensions of a thickness of 2.5 mm, 27.2 courses/2.54 cm and 13.2 wales/2.54 cm.
  • the maximum void has an area of 1.1 mm 2 on the L1 side and 11.4 mm 2 on the L5, L6 side.
  • Three-dimensional knit fabric B Knitting was performed under the same conditions as in the three-dimensional knit fabric A except that 235 dtex/34f nylon 6 multifilament yarns were used as the connecting yarn of the three-dimensional knit fabric A, and the three-dimensional knit fabric thus obtained was scoured and heat set while stretching.
  • the resulting three-dimensional knit fabric has dimensions of a thickness of 1.3 mm, 27.2 courses/2.54 cm and 13.2 wales/2.54 cm.
  • the maximum void has an area of 1.2 mm 2 on the L1 side and 12.0 mm 2 on the L5, L6 side.
  • Three-dimensional knit fabric C Using a double raschel knitting machine of 18 gauge equipped with 5 guide bars and having a bed gap of 4.3 mm, 200 dtex nylon 6 monofilament yarns were fed from guide bars (L2, L3) located at the center to the guide in a 1-in 1-out arrangement as the connecting yarn, 133 dtex nylon 6 monofilament yarns were fed from a guide bar (L1) located in front of the knitting machine to the guide in an all-in arrangement as yarns for the front knit layer, and 133 dtex nylon 6 monofilament yarns were fed from two guide bars (L4, L5) located at the back of the knitting machine to the guide in an all-in arrangement as yarns for the back knit layer at a knitting density of 20.7 courses/2.54 cm to give a three-dimensional knit fabric with the following knit structure.
  • the three-dimensional knit fabric was scoured at 75°C and heat set (180°C) while stretching.
  • the resulting three-dimensional knit fabric has dimensions of a thickness of 3.2 mm, 24.0 courses/2.54 cm and 21.0 wales/2.54 cm.
  • the maximum void has an area of 0.2 mm 2 on the L1 side and 0.4 mm 2 on the L5, L6 side.
  • Three-dimensional knit fabric E Using a double raschel knitting machine of 18 gauge equipped with 6 guide bars and having a bed gap of 5.6 mm, 200 dtex nylon 6 monofilament yarns were fed from guide bars (L3, L4) located at the center as the connecting yarn, 167 dtex/48f polyethylene terephthalate multifilament yarns were fed from two guide bars (L1, L2) located in front of the knitting machine as yarns for the front knit layer, and 167 dtex/48f polyethylene terephthalate multifilament yarns were fed from two guide bars (L5, L6) located at the back of the knitting machine as yarns for the back knit layer in a 1-in 1-out arrangement to L1, L4, L5 guides and in a 1-in 1-out arrangement to L2, L3 and L6 guides.
  • the knitting density was set to 20.4 courses/2.54 cm and a three-dimensional knit fabric having mesh front and back layers with the following knit structure was obtained.
  • the three-dimensional knit fabric thus obtained was scoured at 70°C and heat set (180°C) while stretching.
  • the resulting three-dimensional knit fabric has dimensions of a thickness of 4.0 mm, 27.2 courses/2.54 cm and 13.2 wales/2.54 cm.
  • the repeated compressive residual strain was measured in accordance with "repeated compressive residual strain" measurement method A in JIS K6400. Servopulser made by Shimadzu Corporation was used as the tester and a compression terminal with a diameter of 10 cm was used. Test pieces of 15 cm square were stacked so that the total thickness was 20 to 25 mm and the four corners were fastened by tying with a sewing yarn so that the pieces do not move during measurement, and the repeated compressive residual strain was measured with setting the compression terminal at the center of the sample.
  • the test was performed under the same conditions as in the "method of measuring repeated compressive residual strain" except that a laminated felt in which a synthetic fiber assembly 22 was planted on a three-dimensional knit fabric 10 and/or a synthetic fiber monofilament woven fabric 21 by a needle punch so that the total weight per unit area of each sample was the same was used and the compression load was 1t.
  • the compression recovery of a felt for papermaking was calculated from the following formula. The value in this test is expressed by an index based on the typical laminated felt used in Comparative Example 1 as 1.0.
  • a required number of each of evaluation samples of the three-dimensional knit fabric and a commercially available craft felt having a weight of about 250 g/m 2 (100% polyester, about 2 mm thick, available from MOTOHIRO & CO., LTD.) are cut into 250 mm x 250 mm.
  • the pieces are sufficiently immersed in water and then polyethylene sheet is put on the evaluation samples of the three-dimensional knit fabric and the craft stacked as shown in Figure 5, and a plastic cylinder with a diameter of about 95 mm and a height of about 110 mm is placed thereon and 500 ml of water is poured from the top.
  • a load about 10 to 15 kg under which water does not leak through the plastic cylinder and the polyethylene sheet is applied thereto.
  • the repeated compressive residual strain of the three-dimensional knit fabric A knitted by the above-described method was measured.
  • the repeated compressive residual strain was 15%.
  • a felt for papermaking as shown in Figure 2 was prepared using the three-dimensional knit fabric A.
  • the L1 side of the three-dimensional knit fabric A was placed on a side which did not come into contact with a synthetic fiber monofilament woven fabric.
  • the compression recovery of the felt was higher than that of a conventional felt for papermaking in which the three-dimensional knit fabric was not used.
  • the repeated compressive residual strain of the three-dimensional knit fabric C knitted by the above-described method was measured. As a result, the repeated compressive residual strain was 8%.
  • a felt for papermaking as shown in Figure 2 was prepared using the three-dimensional knit fabric C and the compression recovery was evaluated. As a result, the compression recovery of the felt was higher than that of a conventional felt for papermaking in which the three-dimensional knit fabric was not used.
  • the repeated compressive residual strain of the three-dimensional knit fabric D knitted by the above-described method was measured. As a result, the repeated compressive residual strain was 10%.
  • a felt for papermaking as shown in Figure 2 was prepared using the three-dimensional knit fabric D and the compression recovery was evaluated. As a result, the compression recovery of the felt was higher than that of a conventional felt for papermaking in which the three-dimensional knit fabric was not used.
  • the repeated compressive residual strain of the three-dimensional knit fabric B knitted by the above-described method was measured to be 30%.
  • a felt for papermaking as shown in Figure 2 was prepared using the three-dimensional knit fabric B and the compression recovery was evaluated. As a result, although some effect on the compression recovery was found compared to a conventional felt for papermaking in which the three-dimensional knit fabric was not used, the effect was not as high as those in Examples 1, 2 and 3.
  • the evaluation data of each sample is summarized in Table 1.
  • the repeated compressive residual strain of the three-dimensional knit fabric E knitted by the above-described method was measured to be 15%.
  • a felt for papermaking as shown in Figure 2 was prepared using the three-dimensional knit fabric E.
  • the compression recovery of the felt was higher than that of a conventional felt for papermaking in which the three-dimensional knit fabric was not used, wrinkles were found in wet paper and impact on the wet paper was so great that the felt could not be practically used.
  • Two nonwoven fabrics having a weight of 30 g/m 2 composed of polyethylene terephthalate having an average single yarn diameter of 0.05 dtex prepared by a melt blow method were laminated on the upper and lower sides of the three-dimensional knit fabric C, and they were entangled and integrated by a columnar stream.
  • the laminate has a particle collection efficiency for particles of 0.1 to 5.0 ⁇ m of 85% and a pressure loss of 250 Pa, and is useful as a filter.
  • a piece of craft felt was each laminated on the upper and lower sides of the three-dimensional knit fabric A (permeation rate of water of the fabric: 6 ml/cm 2 ⁇ second) previously cut into a pre-determined size, and the permeation rate of water thereof was measured. As a result, the permeation rate of water was as high as 0.52 ml/cm 2 ⁇ second.
  • a piece of craft felt was each laminated on the upper and lower sides of the three-dimensional knit fabric C (permeation rate of water of the fabric: 8 ml/cm 2 ⁇ second), and the permeation rate of water thereof was measured. As a result, the permeation rate of water was as high as 1.64 ml/cm 2 ⁇ second.
  • the permeation rate of water of a piece of craft felt alone was measured without using the three-dimensional knit fabric, and as a result, the permeation rate of water was 0.10 ml/cm 2 ⁇ second, which was extremely low.
  • the permeation rate of water was measured after stacking two pieces of craft felt, and as a result, the permeation rate of water was 0.17 ml/cm 2 ⁇ second, which was extremely low.
  • the permeation rate of water was measured after stacking three pieces of craft felt, and as a result, the permeation rate of water was 0.24 ml/cm 2 ⁇ second, which was extremely low.
  • the permeation rate of water was measured after stacking four pieces of craft felt, and as a result, the permeation rate of water was 0.31 ml/cm 2 ⁇ second, which was extremely low.
  • the permeation rate of water was measured after stacking five pieces of craft felt, and as a result, the permeation rate of water was 0.33 ml/cm 2 ⁇ second, which was extremely low.
  • the permeation rate of water was measured after stacking six pieces of craft felt, and as a result, the permeation rate of water was 0.17 ml/cm 2 ⁇ second, which was extremely low.
  • the three-dimensional knit fabric of the present invention comprises a knit fabric constituting front and back sides and a connecting yarn composed of a monofilament. Since at least one of the three-dimensional front and back knit fabrics has voids, the three-dimensional knit fabric is useful as an interlining material of a laminate with various other materials, and has a characteristic that the repeated compressive residual strain is small. Moreover, by using a thick three-dimensional knit layer as an interlining material, lamination with a nonwoven fabric by a needle punch and entangling by spunlacing become possible, and the laminate can be suitably used for a felt for papermaking, air filters, water squeezing materials and filter materials.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • Nonwoven Fabrics (AREA)
  • Filtering Materials (AREA)
EP05761808A 2004-07-27 2005-07-25 Three-dimensional knit fabric, interlining material and complex fabric Withdrawn EP1775364A1 (en)

Applications Claiming Priority (2)

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JP2004219238 2004-07-27
PCT/JP2005/013591 WO2006011453A1 (ja) 2004-07-27 2005-07-25 立体編物および芯材並びに積層体

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CN111041699A (zh) * 2019-12-23 2020-04-21 苏州君辉纺织有限公司 一种基于异形dty丝的功能性间隔针织面料
CN115449968B (zh) * 2022-09-15 2023-11-07 南京航空航天大学 一种编织针刺一体化预制体成形方法及预制体成型装置

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